Improvement in safety-valves



l'. BAINS.

Safety-Valves.

Patented March 18, 18 73.

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are to make a right angle or less with other at the vertex. A referenceto the draw- PATENT OEEIoE. f

GAEEIEL J. EAINs, oE AIKEN, soUTH cARoLINA.

n IMPROVEMENT IN SAFETY-VALVES.

Specification forming part of Letters Patent No. 136,938, dated March18,1873.

To all whom t may concern:

Be it known that I, GABRIEL J. BAINS, of Aiken, in the county of Aikenand State of South Carolina, have invented a new and usefnl Improvementin Safety-Valves, of which the following is a specification: Y

Figure lis a perspective view; Fig. 2, a vertical section of my improvedvalve. Fig. 3 is an outside view of the pipe containing the valve. Fig.4 is a sectional view of the form of valve now in use.

Similar letters of reference indicate corresponding parts.

My invention relates to a hollow-cone safety-valve for steam-escapesfrom steam-boilers of every description, which cone is made to cover andin part inclose the end of the escapepipe, on which it is made to fitsteam-tight, pressed down upon it by weights, spring, or other device;`and the elements of this cone each ing fully explains the invention.

V is the hollow-cone valve; a, its groundseat on the pipe B; and b, theorifice of the escape-pipe; and these constitute the main part of myinvention.

My valve, in construction and operation, is

the opposite of the common safety-valve most in use, a diagram of whichcommon safetyvalve, V', will be found in Fig. 4 of the draw- Ing.

It is ofthe first importance in the construction of my hollow-cone top Vthat the angle of the vertex t should be a right angle or less and Idesire this feature to be especially 11oticed.

The chief advantage of this valve is that, owingI to the inclination ofits outer sides, the steam has no power while escaping to cause it to beforced back upon the seat. If the angle of the cone would be in excessof ninety degrees the steam would gain such power, and thereby retardthe escape. In ordinary safety-valves this is the chiefobjection, thatsteam, as `soon as it commences to escape, causes a pressure upon thetop of the valve, which tends to shut the same, thereby materiallyinterferfering with the necessary escape.

Having thus described my invention, I claim as new and de sire to secureby Letters Patent- The inverted-cone valve V, made to cover and in partinclose the end ofthe escape-pipe b, the elements of the cone forming an`angle of ninety degrees or less, when constructed and arranged as setforth.

Witnesses:v GABRIEL J. BAINS.'

HENRY SMITH, W. W. HUNTING.

